香腺可能是一种变形的顶泌腺。()
参考答案:对
I stay at home _______ on weekends, but I don’t feel ______.
A.lonely, lonely
B.alone , lonely
C. lonely , alone
D.alone, alone
最可能发生晕厥的心脏瓣膜病是()
A.二尖瓣狭窄
B.主动脉瓣狭窄
C.肺动脉瓣狭窄
D.二尖瓣关闭不全
E.主动脉瓣关闭不全